Reviews translate admin 764462

This solves the [bug 764462](https://bugzilla.mozilla.org/show_bug.cgi?id=764462) after being reopened.
**Public users**: text from review is translation via a redirection (no more ajax and Google API call).
**Admin users**: click to translate replaces the text (see the screenshots).

#### Before clicking:
![before clicking translate](https://f.cloud.github.com/assets/145172/1565769/47b89f6a-5084-11e3-8ef6-e8a6c015ad90.png)

#### After clicking:
![after clicking translate](https://f.cloud.github.com/assets/145172/1565770/4a360606-5084-11e3-929c-d7a4f99c02ad.png)